Molding-machine



.W. LEWIS;

MOLDING MACHINE.

APPLICATION FILED JULY 24. 1920. v

Reissued Oct. 26, 1920. 14,968.

6 SHEETSSHEET I.

Will/533 IN V EN TOR.

wzzw/i a g ATTORNEY W. LEWIS- MOLDING MACHINE. APPLICATION FILED JULY24.1920.

Reissued Oct. 26, 1920.

IN VEN TOR.

l ATTORNEY w. LWIS. Momma MACHINE.

APPLICATION FILED JULY 24.1920.

Reissued Oct. 26, 1920. 14,968,

J ATTORNEY W. LEWIS.

MOLDING MACHINE.

APPLICATION FILED JULY 24. 1920.

15 as 5 29 2 W6 W '1' P BIZ ll 3 Z6 5 27 M ii a 1 Z 4 3L AF; 1

WITNESS. r A! INVENTOR.

Mjl/y a flfl. Y B Y e 44 ATTORNEY w. LEWIS.

MOLDING MACHINE.

'APPLICATION FILED JULY 24.1920.

Reissued 0 26, 1920. 14,968.

6 SHEE'I'S SHEET 5.

mmm INVEN TOR.

44-4 A TTORNEY W. LEWIS.

MOLDING MACHINE.

APPLlcATmM LEn lULY 24.1920.

Reissued Oct. 26, 1920.

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III

wywgsg, INVENTOIIQ. M

Q BY

qiz, ATTORNEY and with more details shown.

UNITED STATES PWATENT OFFICE. I

WILFRED LEWIS, OF HAVERFORD, PENNSYLVANIA, ASSIGNOR TO THE TABOR MANU-FACTURING COMPANY, OF PHILADELPHIA, PENNSYLVANIA, A CORPORATION OFPENNSYLVANIA.

MOLDING-MACHINE.

Original No. 1,343,835, dated T 0 (all whom it may concern Be it knownthat I, W ILFRED LEWIS, a citizen of the United States of America,residing in Haverford, in the county of Montgomery and State of.Pennsylvanla, have invented a certain new and useful Improvement inMolding-Machines, of which the following is a true and exact descripton, reference being had to the accompanying drawings, which form apartthereof.

y invention relates to molding machines of the type known as roll overjar moldlng machines, the leading features of which are shown anddescribed in my patents numbered 1,157,403, 1,157,404. and 1,157,405.The object of my present invention is to generally improve theconstruction and mode of operation of such machines and particularly toso construct the machine that it will be capable of handling molds ofwidely difierent size and weight without dangerous strains on themechanism that the roll over mechanism may be adjusted to operate withmolds-of different sizes without affecting the table in its patterndrawing position that the projecting stop arm on the roll over table canbe eliminated-that the danger of projecting the anvil out of the machinein case of breakage is avoidedthat the operation of the machine to rollover the table is prevented when certain important parts are improperlyadjusted-that the elimination of strains tending to break the jarringpiston is provided for.

The nature of my improvements will be best understood as described inconnection with the drawings in which they are illus trated and inwhich- Figure 1 is a side elevation of the upper part of my improvedmachine in the position occupied by its parts after rolling over a moldand with some details omitted which are shown in other figures.

Fig. 2 is a similar viewwith the machine in the position itoccupiesduring jarring Fig. 3 is a front elevation of the machine as shown inFig. 2 with the fluid tank which connects with the auxiliary cylinderand its connections to the pressure air system indicated.

Fig. 4 is a vertical central section taken as on line 4-4 of Fig. 3.

dicated at A A Specification of'Reissued Letters Patent. R eissued Oct26, 1920;

June 15, 19 20, Seria1 No. 322,664, filed September 9, 1919. Applicationfor reissue filed .Tu1y 24, 1920. Serial No. 398,804. 1

Fig. 5 is a sectional view of the valve indicated at Q. I

Fig. 6 is a sectionalview of the valve indicated at P.

Fig. 7 is a sectional view of the valve indicated at R, and

Fig. 8 is a central vertical View of the lower parts of the auxiliarycylinder and piston and of the valve indicated at N.

A indicates the foundation for the machine, A a casting supporting inpart the casting which forms the lower portion of the two stationarycylinders, and formed or provided with the semi-circular grooves in- Band B indicate the lower portions of the main cylinder in which thefloating anvil moves, and of the auxiliary cylinder. l3 and B indicatethe upper portions of said cylinders shown as formed in a separatecasting. b is a pas sage leading into cylinder portion B, and b apassage leading into cylinder B. .C

is the floating anvil having a head or platform C at its top and acylinder C formed in it as shown, and connecting through a port C withthe cylinder in which the anvil moves. Fitting in the base of cylinder 0is a thimble C centrally perforated and having a valve seat C at the topof its perforation. C is a vertical hole formed in head C; C7, G etc.,spring chambers formed in the base of the anvil, C a hori zontal holethrough head C through which the trunnion pin H passes. D is the jarringpiston working in cylinder C The piston and its upwardly extending stemare. centrally chambered as indicated at D, D

indicating a port through which pressure air enters and instead offorming this piston integral with the mold supporting table, D secure itto said table by a yielding joint approximating in character to a balland socket friction joint, and this constitutes one feature of myinvention and avoids the liability) developed in practice to crack thepiston As shown, the top of piston D, indicated at D is formed as a headhaving spherical shoulders D*, D}, the lower shoulder fitting against aseat D in the table D and the upper shoulder fitting against a clamp orclamps D held in place by bolts 1)". The table D is formed with a portD, a vertical hole 1), and with lugs holding at its end a valveindicated at E which coacts with the valve seat C The above describedmechanism has to do with the air feed to and from the cylinder C beneaththe piston D, and need not be par ticularly described since it forms nopart of' my present invention. F, F, etc., are perforated heads fittingin the tops of the perforation C in the anvil and have extending fromthem the hollow perforated tubes indicated at F F eto., F F F F, etc.,*being coiled springs abutted'a ainst the bottom of the cylinder castingand against the heads F, as shown in Fig. 4, and serving as a cushionfor the anvil C. G indicates the roll over table which is formed withproj ecting arms G, G, in which, as shown, best in Fig. 1, is formed theerforation Gr, through which passes a pin by means of which the rollover table is pivoted to the arms D of the table D The arms G also haveformed in them the large bearings G Gr indicates the mold box secured onthe roll over table G. H, H are bell crank levers turning on thetrunnion pin H which extends through the floating anvil. These bellcrank levers support the pins H? to which the links J, to be hereafterdescribed, are pivoted and are formed with broad bushing seats H Hindicates an arm extending out from bell crank lever H as indicated inFig. 2, in which is secured a spring acting against a finger H alsoformed on the bell crank levers are the shoulders H which support thebell crank levers and the table G in proper rolled over position byabutting against adjustable stops indicated at H secured in brackets Hon the table C. I and I are eccentricbushings which are adjustablysecured in the bearings G and-H and which carry the pins I I to whichare connected the two ends of the link 1 This feature of construction,to wit, the double eccentric bushings, by which the links or connectingrods I are connected to the bell cranks H and the arms G, is animportant factor of my invention by which the machine is adapted tohandle mold boxes of different.

sizes and weights with due regard to the location of the center ofgravity of the mass in the turning over operation and without affectingthe adjustment of the table in pattern drawing'position. J, J, J, J arepairs of links pivoted to the pins H of the bell crank levers 'H andcarrying at their lower ends cross pins and rollers as indicated at JThese links also carry the rollers indicated at J J against which thefingers H abut in certain positions of the bell crank levers. K, K arestop castin s slidin ly secured by means of lugs K, I to rodsB" securedonthe castings B and formed with astop shoulder K adapted to engage theroller J 2 on the links J, J, in certain ositions of said links. Thestop castings are, as shown, formed with forwardly projecting limbs K attheir bottoms and forwardly projecting limbs K? at their tops,these'lupper limbs being adapted to serve as stops, as are also thereplaceable stop blocks K and K, which are secured on rods K extendingbetween the limbs K and K and, as shown, are held in position when usedby a bar K the upper end of which, indicated at K, abuts against thestop block, and the lower end of which, forked, as indicated at K, formsa housing for a spring K which thrusts the bar K upward against the stopblock. K K indicate springs supported on the casting A and actingagainst the lower part of the arm K to thrust the stop blocks K upward.K K are adjustable shackles secured to the bottom of the limbs K and towhich are secured the ends of the chains K 5, which pass around thesemicircular slots A and hold the stop blocks K in position against thethrust of the spring K L,L are shoulders secured on the ends of pistonrods L which pass through perforations in the limbs K and entercylinders L which cylinders are connected to a con-- duit indicated atwith a portion of the pressure air line to which air is admitted duringthe'jarring operation of the machine and from which air is. exhaustedduring the roll over operation of the machine; such a connection isindicated in Fig. 3 at L.

M indicates the piston working in the auxiliary cylinder B, B As shown,it is provided with a head M, which abuts against the tableC when thepiston isforced upward and on which is formed a guideway for the pin Msecured in the perforation C of the table C, C, and having an upwardextension M which extends into the perforation D of the jarring table DTo the bottom of the piston M, which is made hollow,as shown, is securedthe head M hav-v ing extending upward from it the hollow sleeve M intothe lower end of which is screwed the bushing M, and in which moves theguide spider indicated at M to which is secured the upper end of thetubular rod M ,Ion the lower end of which is\secured theperforated'valve indicated at M, the lower end of the rod and the valvethrough the port 6 formed in the bottom of the cylinder part B.

Secured beneath the port 7) is the valve casing, indicated at N,having'a lateral port opening N leading into it, and formed with casingN, as shown, and having formed on or secured to its upper end the valveindicated at N having an annular seating portion N adapted to seatitself on the seat N and an interior valve seat portion indicated at N.N is a valve normally seated against the seat L 6 and formed with aperforation N having a valve seat at its top, an opening through lateralorifices into the sleeve N and through it to the casing N. This valve isnormally held against the seat N by a spring indicated at N, supportedas shown, in the sleeve N 1 Referring next to the system by which airunder pressure is introduced to the machine 0, Fig. 3 is the air supplypipe, 0 a cutoff valve, 0 a branch of the supply-pipe from which extendthe two branches'O O, and O is a thirdbranch, 0 being a branch pipeconnecting the branch 0 to exhaust and .provided with a flow restrictingdevice at its end, as indicated at 0 O and O are valves in the branchesO and, by preference, these valves are interlocked as by means ofinterlocking disks indicated at O and 0 for purposes which will behereafter described. 0 is a valve located at the junction of the branch0 and the exhaust pipe 0 by means of which the branch 0 can be cut offfrom the supply pipe 0 and opened to exhaust when the valve 0 is intheposition indicated in dotted lines, or cut off from exhaust andconnected to the air supply pipe by turning the valve through 90. Inaddition to the valve handles for normal operation of' the valves,indicated in Fig. 3, I provide the valveO with a second actuating leverindicated at 0 for purposes which will be hereafter described. 0 is abranch of the air-conduit 0 leading to an oil tank 0 from the bottom ofwhich a pipe indicated at O is connected to the port n of the valvecasing T.

P is the valve through which air is admitted to the machine for jarring.As shown-in Fig. 6, the casing is formed with chambers P, having a valveseat P at its top, and connecting through a port with the chamber P P isthe valve located in the chamber P and secured to a spindle P, the upperend of which, indicated at P is so located that the roll over table G,whenresting on the jarring head D will press down the spindle P and openthe valve P which valve is pressed upward toward its seat by the springP". The chamber P has extending from it a pipe section P which extendsthrough the passage D on the head D and connects with the port D leadininto the internal chamber of the piston shown in Fig. 4. The lowerchamber P is connected bya flexible hose, indicated at P with theconduit 0 so that when the valve, indicated at O is open the air willflow freely into the valve casing P, and when the valve P is open, intothe jarring cylinder, a

Q is a valve casing secured to the top of the auxiliary piston M, andhaving the internal construction best shown in Fig. 5, that is,-it isformed with a lower chamber Q having'a valve seat Q at its top andcommunicating through said valve seat and port with the chamber Q Qbeing a valve adapted to seat itself in the valve seat Q toward which itis pressed by the spring Q, the valve having extending from it theactuating rod Q the upper end Q, of which is pressed down bycontact withthe under side of the head C of the floating anvil when the piston M israised into contact with said head. The chamber Q, is

connected by a flexible hose Q with a conduit O and the chamber Qthrough an elbow Q connects through a flexible hose Q by which it isplaced in communication with the pipe indicatedat R leading to thevalveR, as'will be hereafter described.

The valve R, the detail of which is best shown in Fig. 7, is secured onthe front of the casting B, as shown in Fig. 4;, and has formed'in it achamber R, with a valve seat R at its bottom, and a lateral port Rleading into the bottom of the cylinder in which the floating anvilmoves through a port 6. l The upper part of the chamber R forms acylinder R with a portR leading into its top, to which port is connectedthe pipe R, connected in turn to the flexible hose Q as already stated.Below the valve seat R is formed a sleeve R opening freely through portsR to the atmosphere and to which is connected a cylinder R having apiston rod bearing R formed in its top. R is a valve adapted to seatitself on the seatld and formed with a cylindrical extension R whichworks in the cylinder R and in which are formed openings R, which, whenthevalve is raised, are closed by comin in contact with the walls of thecylinder but which are open to the chamber R when the valve is in itslower position. From the bottom of the valve R extends the perforatedpiston rod R with openings formed through it at top and bottom, asshown, and connected at its lower end with the piston R workin in thecylinder R The bottom of the cylinder R is connected, as shown, with theair conduit O At S I have indicated an elevator construction upon whichthe mold box is deposited after the roll over action of the ma chine andwhile the pattern is being drawn. As'this part of the machine forms nopart of my present invention I have not shown it in detail or any of itsparts. J

Inits operation solely as a jarring machine the apparatus shown presentsno particular feature of novelty'except in two features. the pressureair passes through conduit 0 and hose P to'chamber P" of'casing P, andthe roll over table G, resting on head D presses down steam P and valveP permitting the air to pass to chamber.P and through pipe P and port Dto the chamber D formed in piston D. Thence it passesto cylinder G thevalve :E being seated on port (3 and forces up piston D and the partssupported by it, While at the same time it forces down the floatinganvil against the pressure of its cushion springs F F The valve E owingto its elastic support, maintains contact with its seat for a timeduring the described movements of the anvil and piston, but is finallylifted therefrom per-i mitting the air in cylinder C to exhaust throughthimble C and port C to the bottom of cylinder Dand port 6, from whichit passes to port R and chamber R. of

valve R, and the valve RP being open, as

shown in Fig. 7, the air exhausts freely,

The 7 effected. The operation being rapid and continuous, as of coursethe valve E closes whenever thepiston D moves down and the 1 anvil movesup..

As heretofore constructed the piston .D, and parts connecting it withthe jarring head D have been rigidly connected to .the head or formed ofa single casting, and the Strains occurring during arring shown atendency tobreak or crack the piston or its connections. To overcomethis defect I have made the. piston a separate part from the head and;secured themtogether by a yielding connection, so that the piston canhave a very slight angular movement with respect to the head. This isbest accomplished as shown in Fig.4 where the union of the piston andhead is in the nature ofa ball joint, though practically unyieldingexcept under the severe strains induced by jarring.

Another novel the jarring operation of the machine, though it acts upondevices which operate during the roll over operation, is theintroduction of a supporting device which lifts and presses against theroll over mechanism on the floating anvil during jarring and re- Thevalves 0 and 0 being open,

have

feature having to do with leases during the rollover "action. As

shown, the opening of valve 0" in conduit 0* vpermits air to passthrough conduit 'L with the ends of links J, pressing them up Ward andputting all the joints of the bell crank levers H, H, and partsconnected. to them, under pressure so that they will not rattle duringjarring and will not be so liable to wear. The closing of the valve .0of course permits the air to exhaust from cylinders L and the piston Lto move down to non-operating position as shown in Fig. 1.

:Referring now to those parts of the machine which have to do with theroll over operation, I will explain first, that after the jarring of themold is completed, and when it is desired to roll it over into positionfor drawing the pattern, the valves 0 and are closed andthey are shownin their closed position in Fig. 3, and it will be noticed that in thisposition the inter-locking disks 0 and 0 areso interlocked that thevalve 07 cannot be opened until the valve 0 is first opened, and it willalso be noticed that the interlocking between the disks is such thatwhen the valve 0 [is opened the valve 0 cannot be closed; The air beingshut off from the jarringmechanism the valve 0 is opened so as to admitair to the conduit 0 and to close theexhaust pipe 0.- air'under pressurewill also flow through the branch pipe 0 into the'oil tank 0 from whichthe oil will-pass through the port 0 to the port N of the valve N. Fromthe pipe 0 the air passes through the hose Q to the valve A and into thechamber Q, and, when the auxiliary piston M is raised, so that its'head'M comes in contact with the head C of the floating anvil, thespindle Qf'is pressed down opening'the valve Q and letting the air passto the chamber Q andvthence to the hose Q, from which it passes to thepipe R and into the top of the cylinderR pressing down the piston R andseating the valve R on the seat R so that the air will pass through theports R of the piston into the chamber R and through the passage R andthe port 6 into the bottom of the cylinder B, where it acts against thefloating anvil as a piston and moves it upward: As'the'floatinganvilmoves upward it carries with it,

the bell cranks H, H, and, of course, the jarring head D the roll overtable G,'the mold secured to the roll over table, and the linkageconnected with the bell cranks, so that the links J, J, J, J move upwarduntil their cross bars J engage with the stops,

K During-the farther upward movement of the floating anvil the upwardmovement of the linksbeing arrested by the stops the bell cranks areturned toward the right on The - shown in Fig. 2 to that shown in Fig.1, in

which position the elevator table S is moved up to receive the mold.During'the latter part of the roll over operation the table G movesdownward by gravity and the bell crank levers H, and linkage connectedtherewith, are brought about to the position indi-' cated in Fig. 1, thefingers H spring supported in the arms H of the bell crank levers,pressing against the rollers J 3 so as to swing the links J, J out intothe position shown in Fig. 1. The further upward movement of thefloating anvilduring the period in which the cross bars of the links J,J move in between the faces K and result in the drawing of the pattern.At the end of this drawing operation the cross bars J 2 come in contactwith a stop which may be K K or K as desired, and again the arresting ofthe upward movement of the links J, J turns the bell cranks H on theirtrunnions with the result of turning the roll over tableback to theposition shown in Fig. 2. Again the final movement of the roll overtable is accomplished by gravity, and with the completion of thebackward roll over action the pressure air is, of course, shut off byturning the valve 0 to the position indicated in Fig. 3, which permitsthe escape of air from the pipe 0 and parts connected therewith, throughthe exhaust pipe and head O 0 so that the machine resumes its positionfor arring as shown in Fig. 2. j

In a general way, the action of the ma chine when rolling over the moldis similar to that of the machine described in my before mentionedformer patents, and perhaps the most important improvement on my earlierconstruction is lnvolved in my use of the similar eccentric bushings Iand I, located respectively in the bell crank H and the arm G of theroll over table, these'bushings carrying the pins 1 ,1 to whichtheconnecting rods I are secured, so that by adjusting the bushingsprovision can be made for variations in the center of gravity ofdifferent mold boxes secured on the roll over table, and in all casesthe center of gravity can be made to pass the dead point in the rotativemovement of the roll over table. v

The use of the two eccentric bushlngs also makes itfeasible for me touse the arm H I and spring supported finger H as a means .for throwingthe links J, J outward, which could not be successfully done if only oneeccentric bushing were used. Again the use of the two eccentric bushingsmakes it feasithe table, as described, in my new construc-,

tion I provide independently movable stops to coact with each pair oflinks J, J, the

stops being normally in alinement with each other and in fixed position,but capable of independent motion. Thus, as shown, the two stopsupporting castings K, K are slidingly secured by the lugs K on the rods13* and are held in fixed position byfthe chains K passing through thecircular grooves A and the springs K and the two stop castings arenormally arranged so that the stop shoulders K are at the same level,and so that the stop shoulders K K or K which. are in use, are also atthe same level, and I secure to eachof the castings 'K, or to some partaffixed to them, cords T, T, see Fig. 3, which pass over guide pulleys,as indicated at T, T, etc., and are attached to a cord T the upper endof which is-attached to a lever arm 0 secured to the valve 0 andoccupying the position shown in Fig. 13 when the valve 0 is closed. Theweight of the cord T is preferably relieved from the lever arm 0 bysupporting it on a light'breakable cord as indicated at T The result ofthis construction is that should either of the stop castings move upwardfrom their normal position the cord T would be drawn down, breaking thecord T, if used, and pulling down the lever so as to open the valve 0allowing fresh air to pass through the conduit 0 into the cylinder Rforcing up the piston R and opening the valveR permitting the pressureair in the cylinder B to escape, with the consequence that all up-' wardmotion of the floating anvil is arrested and the anvil and partssupported thereon, permitted to sink downward. All danger of projectingthe floating anvil from the machine is avoided by this construction,for,

of course, in case ofbreakage of parts which might result in theprojection of the anvil the stop castings are necessarily moved and theair pressure relieved, as described.

The safety devices above described also comeinto operation in case ofany mal-ad justment of the parts having to do with the roll overoperation, so that the machine cannot be operated to roll over unlesstheparts are properly and coordinately adjusted.

Referring next to'the auxiliary cylinder and piston, it will beunderstood that the auxiliary piston M used 'to supplement the airpressure acting through the floating anvil during the roll overoperation, and also that it is an important function in opposing andeasing the momentum of the roll over table and mold at the end of theroll over operation in either direction.- It was, of course,contemplated in my former machines, where such an auxiliary cylinder andpiston is described, that they should accomplish this function, and inmy present machine I have provided means by which they will accomplishthe function under the trying conditions of use more eflectively.

Referring to the construction as shown in Fig. 8, the pressure air whenturned on to efiect the roll over operation passes to thetank O asindicated in Fig 3, and the oil "in this tank passes through the conduit0 into thecasing N, and raising the valve head N passes through the port12 into the bottom of, the cylinder B, where it acts against the pistonM and forces it upward, so that its head M comes in contact with thehead C of the floating anvil and helps in the duty of. raising the anviland the parts supported thereby. As the piston M-travels upward thevalve M remains seated over the port'N until the head M 'comes incontact with the stop M when it is lifted and carried up with thepiston.

On the return movement of the piston M the oil flows through the openport N and back to the tank through the port N, andin case of any excesspressure occurring the valve N 7 would be forcedaway from its seatgivlng a still further clearance for the flow of oil. Toward the end ofthe downward.

movement of the piston the valve M seats itselfin the port N so thatnormally the oil will have to flow upwardthrough the tubular extension Minto the end of the ide M and thence through the tube M and through theperforation in the valve M Again any excess pressure will force openvalve N and the whole arrangement is such as to afl'ord a necessary andwell guarded resistance to the varying pressures due to the roll overoperation and the rising and falling of the floating anvil. 7

Having now described my invention what I claim as new and desire tosecure by Letters Patent, is: I

1. In a molding machine having a base, floating anvil, mold support, aroll over table hinged to said support, and means for causing a verticalmovement of the anvil to communicate a roll over movement to the tableincluding a rock lever pivoted on the anvil, and a connecting rodconnecting said rock lever to the table, the improvement which consistsin providing adjustable ec centric bushings in the rock lever and table,said bushings carrying the pins to which the connecting rod is secured.

centric bushings in the rock lever and table,

said bushings carrying the pins to which the connecting rod is secured,in combination with a fixed stop on the anvil against which the rocklever abuts when the table is in pattern drawing position.

3. In a molding machine having a base, floating anvil, mold support, arollover table hinged to said support, and means for causing a verticalmovement of the anvil to communicate a roll over movement to the tableincluding a rock lever pivoted on the anvil, a connecting rod connectingsaid rock lever to the table, and a swinging link pivoted on an arm ofthe rock lever and adapted to engage with a stop when the anvil israised to a certain height, the improvement which consists in providingadjustable eccentric bushings in the rock lever and table, said bushingscarrying thefpins to which the connecting rod is secured, in combinationwith a finger carried on the rocklever and arranged to contact with theswinging link and swing it out from its normal stop engaging positionwhen the table is in rolled over posltlon. I

4, In a molding machine havlng a base,

floating anvil, mold support, a roll over table hinged to said support,and means for causing a vertical movement of the'anvil to communicate aroll over movement to the table including a rock lever pivoted on theanvil, a connecting rod connecting said rock lever to the table, and aswinging link pivoted on an arm of the rock lever and adapted to engagewith a stop when the anvil is raised to a certain height, theimprovement which consists in providing ad ustable eccentric bushings inthe rock lever and table,

saidbushings carrying the pins to which.

the connecting rod is secured, in combination with a finger carried onthe rock lever and arranged to contact with the swinging link and swingit outfrom its normal stop en"- gaging position when the table is inrolled over position and a fixed stop on the anvil against which therock lever abuts when the table is in pattern drawing position.

5. In a jar molding machine, an anvil having a cylinder formed in it, incombination .with a mold supporting table and a piston working in thecylinder formed in the anvil and secured to saidtable by a yieldingjoint;

6..In"a jar molding machine, a floating anvil having a cylinder formedin it, in combinationwith a mold supporting table and a piston workingin the cylinder formed in the anvil and secured to said table by ayielding'joint.

7. In a rollover jar molding'machine hav-' mg a floating anvil whlchserves also as a piston for actuating the rock over table and drawingthe pattern, a cylinder in which said piston moves, an exhaust valve forre lieving pressure in said cylinder, and two sets of mechanism attachedto opposite sides of the anvil piston for rolling over the table set inaction by the engagement of an element of each set of mechanism withstops, the improvement thereon which consists in making the stopsrelatively movable and combining with them a movable anchoring devicefor holding them in normally fixed operative position and mechanism foractuating the exhaust valve to open it when one stop is movedappreciably out of registry with the other. 1

8. In a roll over jar molding machine having a floating anvil whichserves also as a piston for actuating the rock over table and drawingthe pattern, a cylinder in which said piston moves, an exhaust valve forrelieving pressure in said cylinder, and two sets of mechanism attachedto opposite sides of the anvil piston for rolling over the table, eachset consisting of a rock lever secured to the anvil, a connecting rodsecured to the rock lever and the roll over table by adjustableeccentric bushings, swinging links pivoted to arms of the rock lever andengaging when the anvil piston is raised to roll over the table withstops, the improvement thereon which consists in making the sto srelatively movable and combining with t em a movable anchoring devicefor holding them in normally fixed operative position and mechanism foractuating the safety valve to open it when one stop is moved.appreciably out of re istry with the other. a

9. In a roll over jar molding machine having mechanism supported on theanvil and operating to turn over the rock over table when the anvil israised through a certain distance, the combination with the turn overmechanism, of means for supporting its weight and taking up lost motionin its connections during the operation of the machine in arring a mold.

10. In a roll over jar molding machine having mechanism supported on theanvil and operating to turn over the rock: over table when the anvil israised through a certain distance, the combination with the turn overmechanism, of means for supporting its weight and taking up lost motionin its connections during the operation of the machine in jarring amold, consisting of a cylinder connected to the air supply during thejarring operation of the machine, a piston working in said cylinder, anda supsaid operative during the roll over operation of the machine and anauxiliary cylinder and piston operative during the roll over operation,said auxiliary cylinder being supplied by liquid put under pressure whencompressed air is admitted to .thecylinder in which the floating anvilworks, theimprovement which consists in providing for the admission andexhaust of liquid from the auxiliary cylinder by a valve opening freelyto admit liquid to the cylinder and closing against exhaust flow, incombination with an exhaust port, a valve with a vertical passage formedin it operating to partly close said exhaust port when seated on it, andmeans for lifting said valve from its seat actuated by theauxiliarypiston and operating to lift and hold said valve from its seat onlyduring a period when the piston is a determined distance above itslowest position.

12 In a roll over jar molding machine having a floating anvil servingalso as a piston operative during the roll over operation of the machineand an auxiliary cylinder and piston operative durin the roll overoperation, said auxiliary cylin erbeing supplied by liquid put underpressure when compressed air is admitted to the cylinder in which the.floating anvil works, the improvement which consists in providing forthe admission and exhaust of liquid from the auxiliary cylinder by avalve opening.

freely to admit liquid to the'cylinder and I closing against exhaustflow, in combination with an exhaust port, a valve with a verticalpassage formed in it operating to partly close said exhaust port whenseated on it, means for lifting said valve from its seat actuated by theauxiliarypiston and operating to liftand hold said valve from its seatonly during a period when the piston is a determined distance above itslowest position, and a second exhaust valve held seated by springpressure. 7

13. In a roll over jar molding machine having a floating anvil servingalso as a piston operative during the roll over opera tion of themachine and an auxiliary cylinder and piston operative during the rollover operation, said auxiliary cylinder being supplied by liquid putunder pressure when compressed air is admitted to the cylinder in whichthe floating anvil works, the improvem'ent which consists in providingfor the admission. and exhaust of liquidjfrom the auxiliary cylinder byvalve mechanism. consistmgof a casing connected to the source of liquidsupply and to the bottom of the auxiliary cylinder, and having a valveseat formed near its top, in combination with a valve slidinglysupported in the casing and adapted to seat itself on said valve seat,said valve being formed with a central perforation and a downwardlyfacing valve seat surrounding it, a second the Second valve, and havinga restricted valve, normally held against said valve seat passage formedthrough it, and means actuby a spring abutted against an extension ofated by the auxiliary plunger for holding 10 the first valve and formedwith a central said third valve away from the seat when 5 perforationhaving an upwardly facing the piston is a determined distance from valveseat surrounding it, a third valve the lower piston. adapted to seat,itself on the valve seatof I WILFRED'LEW-IS.

